Electric meter.



KON'RAD ROBERT SING-ER, OIE' NUREMBERG, GERMANY, ASSJIGNE, '1MB lltiiliif SCHUCKEBJT WERKE, GESELLSCHAFT M11' BESCHRAWKTER HAF'llliltitr, lt @QE-w PORATION OLE GERMANY.

ELECTRIC METER.

Specification of Letters Patent.

Application tiled March M, 1915. Serial No. M5320.

To all 'whom t may concern. v

Beit known that l, KONRAD ROBERT SINGER, a German subject, and resident of Nurem berg, Bavaria, Germany, have invented certain new and useful improvements in Electric Meters, of which the following is a. specification.

` This invention relates to a metering apparatus for alternating current and is especially designed to meet the demand of electrical power stations'regarding small. light, cheap and high-grade electricity meters, a feature much to be desired which as wellY known has'so far presented considerable difiiculties to the designer of such apparatus.

The meter according to my invention reppresents a/number of novel features in the construction of the frame. One feature of my invention consists in using as support for the driving system, that is for the'electromagnets, amember made by punching, and in fastening the samelaterally of the central plane of the meter and essentially parallel thereto on the ground plate, and in joining the upper and lower ends of this punched member still farther with the ground plate by 'means of braces. By the term central plane of the meter that plane is understood which is perpendicular to the ground plate and which intersects the latter in its vern tical center line.

By such a connection of the ground plate and the carrier of the driving system the effect is attained that these two constructive elements reinforce or stifen each other and consequently form an extremely strong and rigid frame in spite of their relatively small dimensions and small weight. A further feature of this invention consists in the manner of mounting the remaining parts of the meter, that is to say the rotor, the brake magnets and the counting works on said braces by which the upper and lower ende of the carrier for the driving system are connected with the ground plate. This kind of supporting renders superfluous all especial carriers for the enumerated parts of the meter and simplifies the constriiction and furthermore leaves full liberty tothe designer for arranging the several parts on the frame of the meter. By this the construction of the meter is easily accessible for inspection and of pleasing appearance throughout.

In the accompanying drawing a construen tion of the meter according to the present inventionis described in which Figure l is a front view of the meter, 2 a side view to Fig. 1. Fig. 3 a top view and Fig. t a side View of the meter frame alone.

rllhe frame of the meter is formed by a. ground plate 10 which is punched from sheet metal and the carrier 14 for the driving system with thevbraces 20 and 2l. 'This can rier la and the brace 20 are punched together from sheet iron and are riveted at 18, 18 and 19 to the ground plate l0. The brace 21. is an independent piece made by punching and is also riveted at i9 to the ground plate.

driving system is accomplished by the bolts and screws 22, 22 bymeans of which also the series field magnet 13 which is inserted in the main circuit of the driving system is connected to the carrier 14.

The carrier 14C possesses an opening as shown in Fig. a by which the necessary clearance is obtained for mounting the rotor disk 23, the winding 24 of the series field magnet and the winding 25 of the shunt ield magnet. The part 26 of the carrier lll which closes this'opening at the front is rectangularly bent out of the plane of vthe carrier by whih the height of the carrier is reduced and a further reinforcement ofthe frame obtained. rlhe opening in the carrie-r 14 also extends into the upper brace 2U and forms here the recess through which the part of the Winding 25 is visible which faces the The connection betweenground plate and the carrier 14C -for the.

@Patenteclptprl litt".

titi

axis of the rotor, as shown in Fig. 3. A. f

further recess is provided near the ground plate at the brace 20 for reducing the weight of the same. The front end which points away from the ground plate and is shaped tti like a hammer (Fig. 3) serves as carrier for the counting mechanism which is indi* cated at 30 in l. carries the upper e 23 and the lower brace 2l carries the lower bearing 27' of the rotor and besides also the The brace 20 alsoW aring 28 for the rotor itt brake magnet 29 which is fixed in the known l Q i A I 1,222,042

manner upon three threaded pins with a set screw, as clearly shown in Fig. 1 of the drawing.

The driving mechanism of the meter is of the well known kind. The triple-core shunt field magnet is positioned at the one side'of the rotor disk and provided with a inagnetie back connection 15 which conveys the lines of torce coming out of the middle core through the disk of the shunt field for the driving mechanism back to the lower ends ot the exterior magnet cores. The magnet 1:2 .t'iirtliern'iore contains magnetic shunts to the said magnetic back connection 15 between the middle and the exterior cores which shunts close the path of the voltage choke field. In the d 'awing these shunts are not visible. being covered by other parts. The series tield magnet 13 is ot' the usual U-shaped form and its pole surfaces are enlarged in lateral direction by especially formed pieces or shoes of iron 17 and 1T. It is mounted uponthe carrier 1.4; b v means of the screws QQby which as above mentioned siniultz'ineously the connection between the carrier H and the lower brace 21 is accomplished. The shunt field magnet 12 at its outer cores is fixed upon the carrier 1-1 l by means of two screws,vso that its voke will project above the brace 20. By this it is made possible to place short-circuit windings with regulable resistance around one or both halves ot the yoke. In the drawing for instance said short-circuit winding 1.6 is shown as being arranged upon the rear half of the joke, the resistance ot said winding being regulated in the well known manner by the motion of the wire clip.

For the sake of completeness there are further shown in the drawing the fastening eyelets 31, 32 and 33 at the groundiplate, furthermore a strip o twsdieetmetal 3l whose ends project laterall)T beyond the ground plate serving for the fastening of the cap ot thecasing, and finali)r the terminal board 35. This terminal board which is inadet'rom iiisulating material is constructed in the known manner, so that the smooth edge of the ground plate 10 does not need to be interrupted for thefastening thereof. The terminal board is fixed on the back of the ground plate l0 by one or more screws which are only accessible 'trom the front ot' the ground plate. For introducing. the terminals into the interior of the meter holes 37 and 37 are provided in the ground plate andftlie ends of the terminals projecting through these holes into the interior of the casing are insulated by extensions on the tei'- and 37.

In the example as shown the carrier 14 for the driving system and the braces '20 and 21 are given particular shapes for the reason" that in order to properly show this construction in ihe drawing a particular driving teni and a particular arrangement of the brake magnet and the counting works had to be assumed. It inust be understood, how.

everA` that these specific forms of the carrier for the dri ving s vsteni and ot the braces are in no way esscnt ial for the present invention.

`These toi-ins may be changed it' according to this invention a carrier shall be constructed tor another driving `system or it' the brake 75 magnet and the counting works shall be otherwise arranged.` Also the rivets between the traine parts 1l, Q0, 21 and the ground plate 10 do not represent the only, possiblekmd oi' connection, as instead there- 8v of also a connection by screws or by welding maiv be employed. 4

Also the wayv ot' making the carrier for the driving works having an upper brace with the other piece integral therewith and the specific construction of the lower brace 1s only one oi the several possible constructions according to this invention. Thus for instance both braces may be made integral with the carrier tor the driving works or having the like sides ot' its two legs fastened 100 substantially at right angles to said plate and adapted to carry on one of its legs the fixed inagnets'of the meter mechanism, and a second sheet metal member. connecting the free end ot' said carrying leg with said plate 105 J and4 supporting conjointly with the other leg the rotatable member of the meter.

In testimony whereof I have hereunto set my signature in the presence of two silbscribing witnesses.

KORAD ROBERT SINGER.

litnessesz Osma Bock, LLEwELIJYN K. lViNANs.

*mina-1 board which fit into the holes 37 60 

